You mean like how DC told Wally West, Stephanie Brown, Cassandra Cain, John Stewart, Ryan Choi, Jason Rusch, Manhunter, JSA, Simon Baz, Power Girl, Tim Drake's entire generation, Cyborg and so many other fans to BLEEP off?
Most of these folks actual SOLD books.
Was it not Jaime Reyes's run that was longest Blue Beetle run? Where is he at?
Was it NOT Cassandra Cain that proved that Batgirl could sell? Let alone an Asian female lead title? The longest solo run before Kamala bypassed her?
So why should these folks be denied? Because many were for many years and some never came back.
Scott Lang is the one with 3 movies while we still wait on bigger names to have a movie or a DECENT one (looking at YOU JLA & Green Lantern).And replacing them with legacy replacement characters. How well has that gone lately?
Well if you were in the editorial office of DC-you would have a HARD time proving it overused when the results say KEEP doing it.This isn't a criticism of legacy characters as a concept but the overuse of the concept in current comics.
In terms of POC that is....
DC-Your most successful POC are legacies. Solo, Mini or team up
Kyle with 100+ run
Cassandra Cain 72
Steel with 54 (despite not calling himself Superman)
Jason Rusch 50-60
Jessica & Simon 50
Jaime Reyes 50+
Go below 40 and see Cyborg, Luke Fox and Black Lightning.
Dc has 5 (if we don't count Steel) legacies over 50.
Marvel
Black Panther soon to be 200
Shang Chi 170+
Luke Cage 170
Miles 70+
Ms Marvel 75
Moon Girl 47 (for now)
X-23 under her OWN name 40 (35 as Wolverine)
Sam Alexander is at 49
War Machine about 60-70 (not as Iron Man)
Falcon 32 (as Falcon) 30 as CA (52)
Excluding Miles & Sam (Kamala was using a dormant name at the time)-POC had have success under their own names.
Even if you toss in She Hulk, Carol Danvers, Jane Foster and Ben Riley-DC still buries Marvel.
Nightwing (that was a Superman villain first), Superboy, Tim Drake and Wally West alone buries Marvel in the legacies department.